changelog: add 3.5 item to cover the fix for last partically synced WAL record

[ahrtr]

Linked to #15069

Signed-off-by: Benjamin Wang wachao@vmware.com

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov-commenter]

Codecov Report

Merging #15070 (4c18ff6) into main (108cd9a) will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #15070      +/-   ##
==========================================
- Coverage   74.83%   74.58%   -0.25%     
==========================================
  Files         415      415              
  Lines       34288    34288              
==========================================
- Hits        25658    25575      -83     
- Misses       7012     7069      +57     
- Partials     1618     1644      +26     

Flag	Coverage Δ
all	74.58% <ø> (-0.25%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/proxy/grpcproxy/register.go	50.00% <0.00%> (-25.00%)	⬇️
server/storage/mvcc/watchable_store.go	84.42% <0.00%> (-8.34%)	⬇️
server/etcdserver/api/v3rpc/util.go	74.19% <0.00%> (-6.46%)	⬇️
client/pkg/v3/testutil/leak.go	62.83% <0.00%> (-4.43%)	⬇️
client/v3/concurrency/session.go	85.10% <0.00%> (-4.26%)	⬇️
server/etcdserver/api/rafthttp/msgappv2_codec.go	69.56% <0.00%> (-3.48%)	⬇️
client/v3/leasing/util.go	95.00% <0.00%> (-3.34%)	⬇️
client/v3/experimental/recipes/key.go	75.34% <0.00%> (-2.74%)	⬇️
server/etcdserver/api/v3rpc/auth.go	79.34% <0.00%> (-2.18%)	⬇️
pkg/traceutil/trace.go	96.15% <0.00%> (-1.93%)	⬇️
... and 12 more

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